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Two and a half years ago, we were the second hospital in the world to start with treating patients using Varian's Ethos™. Ethos is a machine with which you can perform both IGRT and online adaptive treatments. It is a conebeam CT based machine, enhanced with artificial intelligence. Due to this artificial intelligence it is possible to treat patients online adaptively within 15 minutes. At the time, we chose to start treating prostate cancer patients adaptively. This enabled us to gain a lot of experience in a short period of time. We have currently treated more than 200 patients online adaptively. Today we offer online adaptive treatments for all common tumours in the pelvis and we are working to expand to other indications. Because our radiotherapy department is relatively small (2500 patients a year), it was important for us that the online adaptive workflow is simple and fast. So the goal was that we wouldn't lose any capacity and we’re still able to treat all our patients. In addition, we have worked on a training program to train the RTTs to advanced adapters. As a result, all adaptive treatments can now be performed by two RTTs only. A doctor and physicist are only present during the first online adaptive treatment fraction of a patient. In this presentation I will elaborate on the Ethos workflow, our training program for RTTs and the treatment results